From: "David A. Black" <dblack@...>
Date: 2008-10-01T20:51:58+09:00
Subject: Re: Mode method for Array

Hi --

On Wed, 1 Oct 2008, Robert Klemme wrote:

> 2008/10/1 Erik Veenstra <erikveen@gmail.com>:
>> Speed is also the reason for "pre-defining" variables used in
>> iterations. (6% faster!!)
>
> Premature optimization IMHO.

As much as I like inject, I have to say I've always felt that the ones
that look like this:

   inject({}) {|h,item| do_something; h }

are kind of unidiomatic. Evan Phoenix was saying recently on IRC (I
hope I'm remembering/quoting correctly) that his rule of thumb was
that inject was for cases where the accumulator was not the same
object every time, and that where a single object is having elements
added to it, an each iteration from the source collection was better.
I tend to agree, though I'm not able to come up with a very technical
rationale.

What say you, oh inject king?


David

-- 
Rails training from David A. Black and Ruby Power and Light:
   Intro to Ruby on Rails  January 12-15   Fort Lauderdale, FL
   Advancing with Rails    January 19-22   Fort Lauderdale, FL *
   * Co-taught with Patrick Ewing!
See http://www.rubypal.com for details and updates!